JP2003063547A - Liquid injector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the corrosion of a structural member caused by contact with the contents. SOLUTION: A liquid injector is provided with a cap mounted on the mouth 1 of a container, a cylinder 3 fixed to the cap 2 and fitted into the mouth 1 of the container, and a piston 4 held within the cylinder 3 through an elastic member and capable of sucking and injecting the content in the container through reciprocal action thereof within the cylinder 3. The elastic member 7 comprises a stainless spring, having a high strength, a high corrosion resistance, and non-magnetism, which has a high N content of a component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid ejector for aspirating, pressurizing and ejecting the contents in a container such as a pump and a spray, and effectively avoids corrosion of components due to contact with the contents. It is what

[0002]

2. Description of the Related Art A liquid ejector generally comprises a cap attached to the mouth of a container, a cylinder fixedly held by the cap and adapted to the mouth of the container, and a reciprocating motion in the cylinder. It is structured such that the piston is combined with a piston for sucking the content, pressurizing and ejecting the content, and the piston is supported via an elastic member so that the piston can always return to the initial position.

In this type of liquid ejector, most of the structural members are usually molded from synthetic resin from the viewpoint of cost reduction and efficient manufacturing. In order to stably secure the desired elastic force of the member,
A metal spring is used.

By the way, the metal spring is arranged in the cylinder which is always in contact with the contents. Conventionally, the one made of stainless steel wire such as SUS304 or SUS316, which has high corrosion resistance, has been applied. In some cases, the spring may be corroded, the contents may be discolored, or the piston may not operate normally.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to propose a liquid ejector capable of avoiding problems such as corrosion of members due to the contact thereof regardless of the type of contents.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a cap mounted on the mouth of a container, a cylinder fixedly supported by the cap and inserted into the mouth of the container, and an elastic member in the cylinder. A liquid ejector having a piston for holding and for reciprocating the inside of the container for sucking and ejecting the contents in the container, wherein the elastic member contains a larger amount of N than is unavoidably contained as a component composition. It is a liquid ejector characterized by comprising a spring of high strength, high corrosion resistance, non-magnetic stainless steel wire containing.

In the above structure, the N content is 0.35
To 0.5 mass% is preferable, and Mn is 5.0 to 7.% for the purpose of increasing the solid solution amount of N.
It should be contained in the range of 0 mass%.

The other components of the elastic member are C: 0.03 mass% or less, Si: 0.5 mass% or less, S: 0.005 mass% or less, Ni: 9.0 to 11.0 mass%, Cr. : 19.0 to 23.0 mass%, Mo: 1.0 to 3.0 mass%, and the balance substantially consisting of Fe. In the present invention, in addition to the above component composition, B: 0.0
It may contain up to 080 mass%.

A liquid containing iodine is particularly suitable as the content in the present invention.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described more specifically with reference to the drawings. FIG. 1 schematically shows a configuration example of a liquid ejector according to the present invention.

In the drawings, reference numeral 1 is a mouth of a container, 2 is a cap that is engaged with and attached to the mouth 1 of the container by, for example, screwing, and 3 is a cylinder held by the cap 2. The cylinder 3 has an opening 3a connected to a pipe S for sucking the content in the container, and a ball-shaped check valve 3b and a passage 3c for closing the opening 3a when the suctioned content is pressurized. A piston guide 3d that is integral with the cylinder 3 is provided so that the cap 2 is inserted into the mouth portion 1 of the container when the cap 2 is engaged with and attached to the mouth portion 1 of the container.

Reference numeral 4 denotes a piston which covers the piston guide 3d and is movable within a gap formed between the piston guide 3d and the cylinder 3. The piston 4 is provided with an ejection port 4a for ejecting the pressurized contents.

Reference numeral 5 is a second piston fitted on the outer periphery of the piston 4 and movable with the piston 4, and 6 is a second piston.
Is a head cylinder that holds the piston 5 in a liquid-tight manner so as to be movable, and is itself movable with the piston 5. The head cylinder 6 and the piston 4 form a jet valve V for jetting the contents at a predetermined pressure. Form.

Reference numeral 7 is an elastic member for elastically supporting the piston 4 in the cylinder 3, and 8 is a pressing member for pressing the head cylinder 6 together with the piston 4 and the second piston 5, and the contents are ejected to the pressing member 8. Nozzle 8a for
Is provided.

When the pressing member 8 is pressed to release the pressing force at that time after the piston 4 reaches the lowermost end of the cylinder 3, the restoring force of the elastic member 7 causes the piston 4 to return to the initial position. At this time, since the inside of the cylinder 3 has a negative pressure, the content in the container is sucked into the cylinder 3 through the pipe S and the opening 3a, and the elastic member 7 inevitably comes into contact with the content. In the present invention, since the elastic member 7 is a spring made of a high-strength, high-corrosion-resistant, non-magnetic stainless steel wire containing a large amount of N, even if the elastic member 7 touches the contents, it is corroded. There is nothing to do.

The reason why the liquid ejector according to the present invention contains N contained in the elastic member 7 in a larger amount than inevitably contained is as follows.

N is usually 0.01 mass% in SUS316.
This is because, although it is contained only in a small amount, it is contained in a larger amount than inevitably contained to increase the strength and contribute to the stability of the austenite phase and the improvement of the corrosion resistance. For that, N is at least 0.35 mass
%, But if it is contained in excess of 0.5 mass%, the nitride cannot be completely dissolved even if subjected to solution heat treatment, resulting in deterioration of workability, toughness, and ductility. become. Therefore, for N, 0.35 to 0.
It is contained in the range of 5 mass% (hereinafter, mass% is simply described as%).

Mn is contained in the range of 5.0 to 7.0%. Mn is an austenite forming element, and
It is an element that significantly increases the solid solution amount of N. Therefore, S
In US 316, it is necessary to contain a large amount of what is usually contained only at 1.50% or less. However, from the viewpoint of maintaining the non-magnetic property due to cold working error and hot workability, 5.0 to 7.0%
It is preferable to contain in the range of.

In addition, the basic composition of the steel constituting the elastic member 7 and the reasons for limiting the composition are as follows.

C: 0.03% or less C is an element that contributes to the improvement of strength. However, if a large amount of C is added, it will combine with Cr to form carbides and deteriorate the corrosion resistance. Therefore, C is 0.03 in the present invention.
% Or less.

Si: 0.5% or less Si is an element used as a deoxidizer during the melting of steel. If Si is added in a large amount, the workability is deteriorated, so the upper limit is made 0.5% or less in the present invention.

S: 0.005% or less Since S deteriorates the workability, it is desirable that it is as low as possible. In the present invention, S is 0.005% or less.

Ni: 9.0-11.0% Ni is an austenite forming element and contributes to the stability of the austenite phase. Further, in order to reduce the work hardenability of steel and improve the cold workability, it is preferable to contain it in the range of 9.0 to 11.0%.

Cr: 19.0 to 23.0% Cr is an element that contributes to an increase in the amount of N dissolved in stainless steel and corrosion resistance, and is also a ferrite-forming element, the content of which is nonmagnetic. From the point of maintenance of 19.0
The content is preferably in the range of 23.0%.

Mo: 1.0 to 3.0% Mo is an element that contributes to an increase in the amount of N dissolved in stainless steel and corrosion resistance, and is also a ferrite-forming element. The content of Mo is 1.0. The content is preferably in the range of 3.0%.

The elastic member (spring) having the above composition is, for example, C: 0.015%, Si: 0.25.
%, Mn: 5.9%, Ni: 9.95%, Cr: 22.07
%, Mo: 1.95%, N: 0.40% containing NAS
A 106 N (Nippon Seisen Co., Ltd.) steel wire can be applied, which has a tensile strength in the annealed state of about 1.4 times that of SUS316L, and has a magnetic permeability even when subjected to a strong cold working. Is 1.01 or less, and the pitting potential in physiological saline is SU.
It is more than double that of S316L, shows high strength and excellent corrosion resistance, and exhibits non-magnetism comparable to AISI205. In addition, from the viewpoint of hot workability, B may be added to the above component composition as needed.
0.0080% or less may be contained.

The check valve 3b provided in the cylinder 3 can be made of synthetic resin.
b can be made of a metal material, and in this case, the above materials can be applied.

The ejector according to the invention is particularly advantageously adapted for ejecting agents such as saline and iodine. Further, as the liquid ejector applied to the present invention, various known liquid ejectors such as a pump type and a trigger type can be applied in addition to the spray type.

A spring of the same size is made from each steel wire of SUS304, SUS316, and NAS106N, and these are immersed in three kinds of liquids containing iodine, which has a strong oxidizing action, only in a region of about 1/3 and sealed. It was kept in a space (a closed container having a capacity of 5 cc) and left for 1 month at a temperature of 50 ° C. to visually observe the corrosion state of the spring.

As a result, with regard to the one using SUS304, the progress of corrosion was observed on the spring in all three kinds of liquids.

Regarding SUS316, the contents of all three liquids did not change, but partial corrosion of the spring was unavoidable.

On the other hand, no abnormality was found in the product using NAS106N containing a large amount of N.

[0033]

EFFECTS OF THE INVENTION According to the present invention, corrosion of constituent members due to contact with the contents is avoided, and stable ejection is possible. In addition, the quality of the contents can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of a liquid ejector according to the present invention.

[Explanation of symbols]

1 mouth 2 cap 3 cylinders 3a opening 3b check valve 3c passage 3d piston guide 4 pistons 4a spout 5 Second piston 6 head cylinder 7 Elastic member 8 Pressing member 8a nozzle S pipe

Claims (6)

[Claims] 1. A cap attached to the mouth of a container, a cylinder fixedly supported by the cap and inserted into the mouth of the container, and held in the cylinder via an elastic member,
A liquid ejector comprising a piston for sucking and ejecting the contents in a container by a reciprocating motion inside the liquid ejector, wherein the elastic member contains a larger amount of N than inevitably contained as a component composition. A liquid ejector characterized by comprising a spring of high strength, high corrosion resistance and non-magnetic stainless steel wire. 2. The liquid ejector according to claim 1, wherein the content of N is in the range of 0.35 to 0.5 mass%. 3. The liquid ejector according to claim 1, wherein Mn is contained in the range of 5.0 to 7.0 mass% as an element for increasing the solid solution amount of N. 4. The composition of the elastic member is C: 0.03 mass% or less, Si: 0.5 mass% or less, S: 0.005 mass% or less, Ni: 9.0 to 11.0 mass%, Cr. The liquid ejector according to claim 3, comprising: 19.0 to 23.0 mass% and Mo: 1.0 to 3.0 mass%, and the balance substantially consisting of Fe. 5. The elastic member is B: 0.0080 mass
The liquid ejector according to any one of claims 1 to 4, which contains less than or equal to%. 6. The liquid ejector according to claim 1, wherein the content is a liquid containing iodine.